Gate-valve



MoaeL) 2 Sheets-Sheet; -1.

J. O. PL'ATT, Jr

GATE VALVE.

No.248,608. Patented 0ot. 25,1881.

Witnesses Inventor: %d@fw (ModeL) 2 Sheets-Sheet 2.

J. G. PLATT, Jr.

GATE VALVE.

No; 248,608. Patented Oct. 25,1881.

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Witnesses Inventor.-

UNITED STATES PATENT Fries.

JOSEPH O. PLATT, JR, OF WATERFORD, NEW YORK.

GATE-VALVE.

SPECIFICATION forming part of Letters Patent No. 248,608, dated October 25, 1881.

Application filed December 31, 1880. (Model) To all whom it may concern:

Be it known that I, JOSEPH O. PLAT'L, Jr., of the town of Waterford, county of Saratoga, and State of New York, have invented a new and useful Improvenientin Straight-Way Doulole Gate-Valves, of which the following is a specification.

My invention relates to improvements in straight-way double gate-valves, and to a manner in which the gates are madeadjustable to their seats by means of engaging curved surfaces constructed upon the backs of the gates, and as more particularly applicable to such valves of this class as have their gate-seats inclined inwardly and toward each other at the bottom.

My invention consists in the manner, as hereinafter described, ofconstructing upon the back of one of the gates of a double gate-valve two oppositely-arran ged and outwardly-curved co n vex projections, with the curves upon the surface of the latter having a greater horizontal th an vertical radius, and upon the adj acentface of the other gate two oppositely-arranged pro- 2 5 jections, each of which contains a curved recess to receive the convex projections upon the other gate, the curves of these recesses also having radii :of greater horizontal than vertical measurement, but with the curves upon the convex projections and the curves of the recesses not coinciding or parallel when the surfaces of both are in contact, the object of my invention and improvement being to sub stitute for the coincident curved surfaces upon the engaging backs of the gates curved surfaces which are not parallel when in contact, and by means ofwhichthe gates may rock and oscillate when adjusting, instead of rotating, as they do in adjusting when the coincident curved surfaces are used.

Accompanyingthis specificatiomandforming a part of the same, are two plates of drawings containing five figures illustrating my invention, and in all of which the same designation of parts by letter-reference is used.

Figure 1 shows,in perspective, the back ofone of the valve-gates in which the projections are produced, containing curved recesses, and illustrates, also, a bisected half of a recess formed on the back of the gate to receive a button in the end of the actuating-stem. In this view,

as well as that designated as Fig. 2, the parts illustrated are shownin greater-proportion than that applied to denote the same parts in Figs. 3, 4, and 5. Fig. 2 illustrates the back of the other gate and the curved projections formed thereon, and when this gate and the one illustrated in Fig. 1 are placed back to back these curved projections engage loosely with the curved surfaces of the recesses upon the other gate, so that the two gates will rock or oscillate on the points where the curved surfaces of the projections engage with the difierently-curved surfaces of the recesses. This illustration also shows another halt of the recess, formed to receive and grasp the button upon the end of the valve-stem when the gates are in an applied position. Fig. 3 shows a vertical section of a valve containing my invention, taken through the center at right angles to the tapering gateseats. Fig. 4 illustrates a vertical section of one of the gates, taken on the line or m of Fig. 2. Fig. 5 shows a vertical section, taken through the line 0 O of Fig. 1.

The several parts of the mechanism composing my invention as applied are distinguished by letters of reference as follows, and their improved function prod ucedby construction thus explained.

TheletterA denotes the valve-stem, by which the gates are moved to open and close by the connection made with the stem by means of the button B, formed on the stem end, and the two-part recessB, produced on the gates, and this may be operated by the thread upon the stem, or any other means by which it will cause the connected gates to open and close when raised or forced down.

The letter V designates the valve-case, and T 1 its water-ways. At d d are shown two inclined valve-seats, and at G and G the gates. On the gate G, as shown in Fig. 2, there are formed two projections, P P, which are curved on their exterior face from U to O, and more abruptly curved from a to a, but neither of which curves has a horizontal and vertical radius that are equal. Upon the gate G there are formed the projections P P, having the recesses A A. These recesses are longitudinally curved from G to C, so as to have greater radii of curvature than from F to F, but neither their cross curve nor horizontal curve has a vertical radius that is equal to the other, and hence neither curved surface is the part of a true sphere. Neither do the compound curves of the projections upon the back of the gate G correspond with those formed in the recesses on the back of the gate G, and thus constructed when the projections upon the back of the gate G and the recesses upon the other gate are brought in surface-contact they do not coincide from the difference of their curves, and hence when in position, as shown in Fig. 3, these gates are constructed to oscillate or rock against each other by means of these differing curved surfaces in adjusting themselves to the seats.

I do not desire to limit my invention to the exact arrangement of differing curves herein shown, but I do make it an imperative that the curves upon the projections and those formed in the recesses 0n the backs of the gates shall not be. coincident when applied to each other, and that they shall be so formed as to permit the gates to oscillate or rock on each other when adjusting, and not rotate, as they would were the engaging curved surfaces upon the backs coincident, as shown to be constructed in the two patents granted to Stephen P. M. Tasker, dated July 9, 1872, and numbered respectively 128,022 and 128,924.

I am also aware ofthe patent granted to H. Mather, No. 225,711, dated March 23, 1880, in

which a concave surface was produced upon the back of one gate and a coincident convex surface was formed upon the other, on which the gates could rotate in adjusting, both of which gates were caused to rise with the stem, and in which respect, as well as in the method of adjustment, this older construction differed from mine.

Having thus described my invention, what 1 claim, and desire to secure by Letters Patent, is-

In straight-way double gate-valves having inclined seats, the combination of the projections P P, constructed upon the back of one of the gates, the projections exteriorly having doubly-curved convex surfaces, and therecesses A A, formed on the back of the other gate, the recesses having doubly-curved concave surfaces, with the convexly-curved surfaces on the projections, and the concavelycurved surfaces of the recesses not coincident when the backs ofthe gates are in applied contact, as and for the purposes described and set forth.

Signed at Troy, New York, this 16th day of December, 1880.

JOS. c. PLATT, JR. 

